Icon for a portion of a display screen



The single FIGURE is a front view of an icon for a portion of a display screen according to the new design.

The broken line showing of the region in the FIGURE and the unshaded area there within forms no part of the claimed design. The broken line showing of a portion of the display screen in the Figure is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an icon for a portion of a display screen, as shown and described. 